Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddb9763f0cb235e5…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 04:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dffc880a36e5d0beb9ff0d93ae625de2 SHA-1: 2b43101f82074ccc95d833ee0454da2475c42f44 SHA-256: ddb9763f0cb235e5e830e97a54f42ba0e7346a2d73250b84aee9cdc58040e4f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including one disguised as a link farm for game cheat codes, suggests a phishing or malware distribution lure. Although no scripts were directly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://malopolskiszlakwinny.pl/upload/File/vukezinutawe.pdf In PDF document text
    • http://www.wcd.com.tw/ezadmin/ckfinder/userfiles/files/61446788639.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/93547278871.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/71826534237.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/vanubatetakixaditefu.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/pexadurusivexedejib.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/eq0j2c8vesgki8erf0lt1i6ja5/nidesexujodufu.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/8572571190.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/90043863892.pdfIn PDF document text
    • http://thaide.org/userfiles/file/sapaxegoribegibosu.pdfIn PDF document text
    • https://comfort8889.com/upload/files/5277500319.pdfIn PDF document text
    • http://raczcsalad.hu/files/xupafovowafigomuxiwimab.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/6s5ci4c36efdhke5828t1guep3/sugojolijisumuviponorid.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/94304651136.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/88832821920.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/sovufimebabojederirur.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/63989221262.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/ruwonegosezusuda.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/samabemamoxupasibimuv.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109140028279741.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/35222821146.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/danisuzabu.pdfIn PDF document text
    • https://residenciasanamaro.es/userfiles/files/58303972871.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/23961177398.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=grand+theft+auto+san+andreas+cheat+codes+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 18052 bytes
SHA-256: a2b06460127a2b813a20fce616ae2116abd342b348cd58dacd0e8e6a7cfaab22
font_01_sfnt_off000101b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B5 10668 bytes
SHA-256: 2b1bd99d13b4f4cb6bcfd4c2d3666936756746d9b042e62b2ee47a0e5a9bb53d
font_02_sfnt_off00011a1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1